Downgrade from 10.3.4 to 10.3.3

[amirage]

Hi, How do I downgrade from stock unrooted 10.3.4 to 10.3.3? Can I simply install the full OTA file via local upgrade? The reason is that I'd like to install Resurrection Rom which is needs 10.3.3 as base. Of course, I'll root the phone once it's on 10.3.3.

Also, the ROM page says I need to install OOS on both slots on TWRP. How do I do this? I'd assume that if the device on stock OOS from the start, that would mean that OOS is on both the slots. Isn't this so? Pls help

 

[djhulk2]

Back up your data, download the full version on oxygen updater, delete all in twrp so that 0000, connect to pc to add the 2.3gb OOS, go back to flash. It will flash OOS official both slots and you will go back to stock, you can root and twrp with tool all in one after back on stock. If that for someone reason doesn't work try the fast boot rom in tool all in one, recovery firmware, delete all option. I have done this option before to lock bootloader back

 

[amirage]

Back up your data, download the full version on oxygen updater, delete all in twrp so that 0000, connect to pc to add the 2.3gb OOS, go back to flash. It will flash OOS official both slots and you will go back to stock, you can root and twrp with tool all in one after back on stock. If that for someone reason doesn't work try the fast boot rom in tool all in one, recovery firmware, delete all option. I have done this option before to lock bootloader back

Thanks comrade